Safety attachment for planers



J. JE NNE SAFETY ATTACHMENT FOR PLANERS Filed June 11, 1928 Patented May 21, 1929.

UNITED STATES PATENT OFFICE.

JACOB JENNE, OF CLEVELAND, OHIO, ASSIGNOR 1'0 THE CLEVELAND PLANER GOM- PANY, OF CLEVELAND, OHIO, A CORPORATEON OF OHIO.

SAFETY ATTACHMENT FOR PLATTER-S.

Application filed June 11,

This invention relates to a safety attachment for an open side planer and the main object of the invention is to provide an automatic safety trip for the rail raising mechanism by means of which the power will be automatically disconnected from the rail raising mechanism should the operator be injured or fail to cut off the power at the proper time.

A further object of the invention is to provide a safety trip for the purpose specified which is simple in construction and comprises few parts and which can be readily attached to or detached from the machine.

A. still further object of the invention is to provide a safety attachment of the character described which is dependable in operation and which will automatically cut off the power should the control levers be left on too long.

Further and more limited objects of the invention will appear as the description proceeds and by reference to the accompanying drawings in which Fig. 1 is a view in side elevation of a planer provided with the preferred form of my automatic safety trip and Fig. 2 is a vertical sectional view on the line 2*2 of Fig. 1 and illustrating the manner of connecting the trip lever to the column and power shaft.

Referring now to the drawings the nu moral 1 designates the bed of the planer, 2 the table which is mounted on the bed and "apable of longitudinal movement thereon in a manner well known to those skilled in the art. 3 designates the knee with the cross rail secured thereto and which is mounted for reciprocatory movement on the column 1. The knee and cross rail are raised and lowered by means of the power elevating screw in a manner well known to those skilled in the art. The machine is provided with the usual rail heads which have automatic feeds in all directions.

Mounted on the top of the machine is a counter shaft 6 which may be driven in any suitable manner either by a motor or from a line shaft. Also mounted on the column at a rotatable shaft 7. on shaft 7 are two pulleys 8 and 9 which are driven in opposite directions. The shaft 7 has a driving connection with a feed screw Disposed between the two pulleys 8 and Sis a clutch 10. Pivotally mounted on the top of the column is a bell crank 11 one end of Rotatably mounted 1928. Serial No. 284,434.

which is connected with the clutch 10 so as to move the same to the right or to the left to connect either the pulley 8 or the pulley 9 with the feed screw 5 whereby to drive the same in either direction. Connected with the opposite end of the bell crank 11 is a lever arm 12 which extends downwardly alongside of the column 4r between the column and the knee. The lower end of the lever arm 12 is bent outwardly as at 13 and secured to the lever arm adjacent the upper end thereof is a pin or projection 14:.

Should the clutch 10 be thrown to connect the feed screw 5 with the pulley 9, the knee will be moved downwardly until the lower edge of the same strikes the projection I 13 whereupon the lever 12 will be moved to move the clutch 10 to the neutral position disconnecting both pulleys 8 and 9 from the feed screw. Should the clutch 10 be thrown to connect the pulley 8 with the feed screw 5, the knee will be moved upwardly until the upper edge of the same strikes the projection 14 whereupon the lever 1.2 will be moved upwardly to move the clutch 10 to neutral position thereby disconnecting both pulleys 8 and 9. In Fig. 2 there is disclosed a lever 15 which may be manually operated to connect the feed screw 5 with either the pulleys 8 or 9. The above described mechanism acts as an automatic trip for disconnecting the feed screwv should the operator fail to cut off the feed at the proper time.

it will now be clear that I have provided a very simple and effective safety attachment for disconnecting the feed screw thereby preventing jamming or breaking of the parts and possible injury to either the operator or the machine.

Various changes may be made in the details of my construction without departing from the spirit of my invention and I wish my invention to be limited only in accordance with the scope of the appended claim. I

Having thus described my invention, what I claim is:

In a planer of the character described having an upright column a knee mounted on i said column and adapted for reciprocatory movement thereon, a screw connected with said knee and adapted to be actuated to move said knee in either direction, means for driving said screw, said means comprising a shaft, a pair ofpulleys mounted on said shaft and driven in opposite directions, a clutch disposed between sa1d pulleys and adapted to be moved to form a driving consaid knee, said lever arm having projections thereon disposed adjacent the opposite ends thereof respectively, said projections extendinto tliepath ofinovement 01. said knee 10 and adapted to be engaged thereby to move said levervarin whereby said clutch Wlll be moved to neutral position to discontinue the movement of said knee.

In testimony whereof, I hereunto a'fiix my 15 signature.

JACOB JENNE. 

